低温胁迫对五种景天科多肉植物生理指标的影响

以观音莲(Herba monachosori Henryi)、姬星美人(Sedum dasyphyllum)、奥普琳娜(Graptoveria ‘Opalina’)、白美人(Pachyphytum oviferum)和虹之玉(Sedum rubrotinctum)5种景天科多肉植物3年生扦插苗为试材,以人工低温胁迫的方法,通过对胁迫后植物叶片可溶性糖含量、叶片相对含水量、脯氨酸含量、丙二醛含量、恢复生长后植物成活率的测定,研究了低温对5种多肉植物的生理影响,以期为筛选耐低温多肉植物品种提供参考依据。结果表明:随着低温胁迫的加剧,5种多肉植物体内脯氨酸含量、叶片相对含水量、可溶性糖含量、丙二醛含量在总体上均呈上升趋势,但增幅略有不同。奥普琳娜的叶片相对含水量和丙二醛含量变化最为明显,观音莲最不明显。在低温胁迫后,5种多肉植物中,观音莲的有机溶质脯氨酸和可溶性糖含量最高,奥普琳娜最低。综合分析得出5种多肉植物的耐寒性从强到弱依次为观音莲>姬星美人>虹之玉>白美人>奥普琳娜。

Effect of Low Temperature Stress on Physiological Index of Five Crassulaceae Succulents

Five species of asexual succulent plants including Herba monachosori Henryi,Sedum dasyphyllum,Graptoveria 'Opalina',Pachyphytum oviferumand Sedum rubrotinctum,were used as test materials to study their cold resistance by artificial low-temperature stress method,which aimed to provide certain basis for low temperature resistant species selection.Physiological indexes such as soluble sugar,leaf relative water content,proline and malondialdehyde under low temperature stress were measured.And the survival rate after low temperature stress were determined.The results showed that the proline content,leaf relative water content,soluble sugar content,and malondialdehyde content in five kinds of succulents showed an upward trend with increasing cold stress,but the increase was slightly different.The changes in leaf relative water content and malondialdehyde content were the most evident in Graptoveria 'Opalina',and the lowest was in Herba monachosori Henryi.Under low temperature stress,the organic solute of Herba monachosori Henryi had the highest content of proline and soluble sugar,and Graptoveria 'Opalina'was the lowest.The cold resistance of the five succulents was ranked in the following order:Herba monachosori Henryi>Sedum dasyphyllum >Sedum rubrotinctum > Pachyphytum oviferum >Graptoveria 'Opalina'.